1:(2 + 4 ÷ 10) × 10
2:(2 + (4 ÷ 10)) × 10
3:(4 ÷ 10 + 2) × 10
4:((4 ÷ 10) + 2) × 10
5:10 × (2 + 4 ÷ 10)
6:10 × (2 + (4 ÷ 10))
7:10 × (4 ÷ 10 + 2)
8:10 × ((4 ÷ 10) + 2)